Sumo 2

Ubiquitin-like protein that can be covalently attached to proteins as a monomer or as a lysine-linked polymer. Covalent attachment via an isopeptide bond to its substrates requires prior activation by the E1 complex SAE1-SAE2 and linkage to the E2 enzyme UBE2I, and can be promoted by an E3 ligase such as PIAS1-4, RANBP2, CBX4 or ZNF451 (PubMed:26524494). This post-translational modification on lysine residues of proteins plays a crucial role in a number of cellular processes such as nuclear transport, DNA replication and repair, mitosis and signal transduction. Polymeric SUMO2 chains are also susceptible to polyubiquitination which functions as a signal for proteasomal degradation of modified proteins (PubMed:18408734, PubMed:18538659, PubMed:21965678, PubMed:9556629). Plays a role in the regulation of sumoylation status of SETX (PubMed:24105744).

Polymeric chains can be formed through Lys-11 cross-linking. Polymeric SUMO2 chains undergo 'Lys-6'-, 'Lys-11'-, 'Lys-48'- and 'Lys-63'-linked polyubiquitination by RNF4.

Cleavage of precursor form by SENP1 or SENP2 is necessary for function.

Monoubiquitinated N-terminally by UBE2W, which primes it for RNF4-dependent polyubiquitination by the UBE2V1-UBE2N heterodimer.

Belongs to the ubiquitin family. SUMO subfamily.

Broadly expressed.

• Nucleus
• Nucleus
• PML body

SMT3B, SMT3H2, SUMO2, Small ubiquitin-related modifier 2, SUMO-2, HSMT3, SMT3 homolog 2, SUMO-3, Sentrin-2, Ubiquitin-like protein SMT3B, Smt3B

• entrezGene:6613
• entrezGene:6612
• omim:602231
• omim:603042
• swissprot:P61956
• swissprot:P55854

Proteins

Metabolism

10871Da